UX animation
In the UX context, easing refers to the transition between states. As a result, “ease in” refers to the motion entering the transition, and “ease out” refers to the motion leaving the transition.
Making adjustments
Not all objects move the same way. Lighter or smaller objects may move faster because they require less force, and larger or heavier objects may need more time to speed up.
Use curved motion and avoid linear spatial paths. Identify the qualities of motion best suited to your object, and represent their motion accordingly. Curves represent that change over time, for a particular value range. Find a curve that fits that character of motion you are describing.